<?php

namespace App\Services\Sms;

use App\Models\SmsVerification;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;

class SubmailSmsClient
{
    /**
     * @param  array<string, string>  $vars
     */
    public function sendTemplate(string $to, string $project, array $vars): SmsSendResult
    {
        $appId = trim((string) config('sms.submail.app_id'));
        $appKey = trim((string) config('sms.submail.app_key'));
        $endpoint = rtrim((string) config('sms.submail.endpoint'), '?&');
        $timeout = (int) config('sms.timeout', 5);
        $signName = $this->normalizeSignName((string) config('sms.submail.sign_name'));

        $payload = [
            'appid' => $appId,
            'to' => $to,
            'project' => $project,
            'signature' => $appKey,
            'vars' => json_encode($vars, JSON_UNESCAPED_UNICODE),
        ];
        if ($signName !== '') {
            $payload['sms_signature'] = $signName;
        }

        try {
            $response = Http::timeout($timeout)
                ->acceptJson()
                ->asForm()
                ->post($endpoint, $payload);
        } catch (\Throwable $e) {
            Log::error('sms.submail network_error', [
                'project' => $project,
                'mobile_mask' => $this->maskMobile($to),
                'error' => $e->getMessage(),
            ]);

            return SmsSendResult::failure(
                SmsVerification::PROVIDER_SUBMAIL,
                null,
                'NETWORK_ERROR',
                'Submail SMS request failed: '.$e->getMessage(),
                ['error' => 'network_error', 'exception' => $e::class]
            );
        }

        $json = $response->json();
        $summary = $this->responseSummary(is_array($json) ? $json : [], $response->status());
        $status = is_array($json) && isset($json['status']) ? (string) $json['status'] : '';
        $sendId = is_array($json) && isset($json['send_id']) && is_scalar($json['send_id'])
            ? (string) $json['send_id']
            : null;
        $code = is_array($json) && isset($json['code']) && is_scalar($json['code'])
            ? (string) $json['code']
            : (string) $response->status();
        $message = is_array($json) && isset($json['msg']) && is_scalar($json['msg'])
            ? (string) $json['msg']
            : '';

        if ($response->successful() && $status === 'success') {
            return SmsSendResult::success(
                SmsVerification::PROVIDER_SUBMAIL,
                $sendId,
                $code !== '' ? $code : 'success',
                $message !== '' ? $message : 'OK',
                $summary
            );
        }

        if (! $response->successful() && $code === (string) $response->status()) {
            $code = 'HTTP_'.$response->status();
        }

        return SmsSendResult::failure(
            SmsVerification::PROVIDER_SUBMAIL,
            $sendId,
            $code !== '' ? $code : 'SEND_FAILED',
            $message !== '' ? $message : 'Submail SMS send failed.',
            $summary
        );
    }

    /**
     * @param  array<string, mixed>  $response
     * @return array<string, mixed>
     */
    private function responseSummary(array $response, int $httpStatus): array
    {
        return [
            'http_status' => $httpStatus,
            'status' => $response['status'] ?? null,
            'send_id' => $response['send_id'] ?? null,
            'fee' => $response['fee'] ?? null,
            'code' => $response['code'] ?? null,
            'msg' => $response['msg'] ?? null,
        ];
    }

    private function maskMobile(string $mobile): string
    {
        if (strlen($mobile) < 11) {
            return '***';
        }

        return substr($mobile, 0, 3).'****'.substr($mobile, -4);
    }

    private function normalizeSignName(string $signName): string
    {
        $signName = trim($signName);
        $stripped = preg_replace('/^[\[【]+|[\]】]+$/u', '', $signName);

        return is_string($stripped) ? trim($stripped) : $signName;
    }
}